Police found a will, a massive intelligence file, and three boxes of ammo at the home of 62-year-old Joseph Pappas

A solitary chair, an intelligence file on a dozen doctors, and three boxes of ammo are just a few of the disturbing items found at home of the man accused of murdering George HW Bush's former cardiologist.

Police raided the Houston home of Joseph James Pappas II, 62, after he killed himself with a bullet to the head on Friday as police cornered him.

He was wanted for the murder of physician Dr. Mark Hausknecht on July 20.

Police were shocked to enter his home and find it bare, with a solitary chair placed in front of a window.

Cops discovered his Last Will and Testament as well as a 'very extensive intelligence file' on Dr. Hausknecht.

Additionally they found a list of names of dozens of other physicians and medical center employees that could have been possible targets, according to KHOU.

'They found a very extensive intelligence file that the suspect had put together on Dr. Hausknecht,' Acevedo said.

'He knew everything that you could possibly find on this man,' he added.

Pappas committed suicide with a gunshot to the head on Friday as Houston police officers closed in on him in front of his home, pictured above,

Inside the home police found a massive file on Dr Mark Hausknecht and a potential hit list

Police found three boxes of the same ammo used to kill Dr Hausknecht, his death scene above

Pappas was wanted by police over the shooting death of Dr Mark Hausknecht (left), who was George HW Bush's cardiologist, in Houston, Texas

Behind his front door he had a large piece of metal that seemed positioned in which a way to prevent forced entry into the residence.

Dr Hausknecht (pictured) was praised by the Bush family who described him as a 'fantastic cardiologist' and 'good man

In the garage police found three boxes of .22 caliber ammunition - the same type of ammo used to kill the Bush cardiologist.

Pappas seemed to be preparing for death.

His home was barely furnished, he organized a will, and he texted a female friend in Georgia that 'he had a terminal illness', according to court records.

To that woman's mother he sent the title to his vehicle and property deed, handing over his home ownership on July 19, a day before the murder.

Spencer also showed cops a picture of Pappas' bicycle that she claimed he sent her on July 23, three days after Hausknecht's murder.

That bicycle matched the one that was caught on surveillance video biking away from Dr. Hausknecht's murder scene on that fateful day.

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Joseph James Pappas (left) is seen with his father, Joseph James Snr, mother and sister in an undated family photo. Police say he murdered a doctor who once treated George HW Bush due to a grudge he harbored over the death of his mother, Julia Alice Walker, on the operating table

Pappas' mother Julia (pictured right with husband) died on Hausknecht's operating table in April 1997. Police said Pappas sought revenge due to anger he felt over his mother's death

Pappas is believed to have murdered Dr. Hausknecht in an act of revenge for the operating table death of his 69-year-old mother Julia Alice Walker in 1997 as she was undergoing surgery by the prominent physician.

On Friday Pappas' 'old family friend' said he texted her saying he 'was going to kill himself', leading her to call police to conduct a welfare check. But when they arrived to his doorstep, he was nowhere to be found.

Later in the day police returned to the home near Brays Bayou Greenway Trail after receiving a tip from two neighbors.

Surrounded by multiple officers, Pappas produced a firearm and shot himself in the head, cops say.

He was pronounced dead on the scene.

His murder of the famed cardiologist shocked the nation on July 20.

Police said on Wednesday that Pappas was the suspect captured on CCTV (above) following Dr Hausknecht on his bicycle as he cycled to work

Dr Hausknecht, 65, was cycling from his home to the Houston Methodist Hospital in his blue medical scrubs when the gunman approached from behind and shot him in the torso and head

Hausknecht was on his way to the Houston Methodist hospital when he was targeted and stalked by the killer, also on a bicycle, for several blocks.

Finally, after passing him by, the murderer turned on his bicycle and fired several shots in Hausknecht's direction.

The doctor was shot twice in the torso and once in the head and was pronounced dead in hospital. Police were perplexed by the killing and described it as a 'real whodunnit'.

After his murder, Dr Hausknecht was praised by the Bush family.

'Mark was a fantastic cardiologist and a good man. I will always be grateful for his exceptional, compassionate care. His family is in our prayers,' the former president said in a statement.